1304356 九、發明說明： 【發明所屬之技術領域】 % 本發明係有關於一種二段式逆滲透水處理系統， 尤其是一種可有效去除水中碳酸成分的二段式逆滲透 水處理系統。 【先前技術】 在純水的製程中，由於逆滲透水處理系統在去除 水中離子與濾除雜質之水質淨化程序的應用上，有難 以取代的經濟性與功能性之優勢，因此逆滲透水處理 系統已經成為半導體業與醫藥業等高純度純水使用者 的必要設備。逆滲透水處理系統使用上的特色之一， 是利用一部份的排放水，將經過濾濃縮後的水中雜質 排出，藉以使逆滲透水處理系統得以在不受因雜質累 積所造成之堵塞的狀況下保持穩定地操作。 但在產業集中與成長的過程中，區域性水資源不 足的情況已逐漸浮現。為提升水處理系統中水的使用 效率，減少處理過程中的廢水排放量，已成為維續產 1304356 業持續成長的必要條件之一。為克服習知逆滲透水處 理系統排放過多廢水的問題，減少必要廢水的排放 量，即有人提出一種二段式逆滲透水處理系統，藉由 提升逆滲透產水的水質以減少淨化(polish)廢水的排 放量。參閱第一圖，係為習知二段式逆滲透水處理系 統的示意圖。習知二段式逆滲透水處理系統係包括， 一前處理器2、第一進水緩衝槽4、第一段逆滲透處理 器6、第二進水緩衝槽8、第二段逆滲透處理器10、 一過濾水儲存槽12及一真空脫氣裝置14。於進行水 處理時，首先於待處理水進入第一段逆滲透處理器6 前加入酸，將待處理水的pH值降至4.3以下，藉以使 水中的碳酸成份(例如，碳酸根離子或其鹽類）全轉變 為二氧化碳，以避免水中的碳酸成份在逆滲透處理的 過程中與鈣等鹼土金屬的離子結合為碳酸鈣等水垢， 造成逆滲透處理器的堵塞。當待處理水經以第一段逆 滲透處理器6過濾去除鈣離子後，再加入鹼調整水的 pH值至8.3以上，藉以使水中的二氧化碳再轉變為重 碳酸根離子或碳酸根離子等碳酸成份。之後，再藉由 第二段逆滲透處理器10去除前述碳酸成份。此時，自 1304356 ’ 第二段逆滲透處理器ίο排出的水中會具有較高濃度 - 的碳酸成份。自第二段逆滲透處理器10排出的水中再 % 加酸，使水中碳酸成份全轉變為二氧化碳，最後經真. 空脫氣裝置14或脫氣塔去除水中的二氧化碳。經由此 去除二氧化碳處理後的水即可再導入前述第一進水緩 衝槽4中與來自水源的待處理水混合後回收利用，藉 φ 以達成減少廢水排放的目的。 但前述習知二段式逆滲透水處理系統中仍存在著 一些問題，例如由於破酸成分係為酸驗平衡的緩衝 劑，致使前述方法中不易進行正確鹼量的添加。當加 入過多的鹼時，除會造成經二段逆滲透處理後的水的 水質劣化，並連帶加重後段處理的負荷之外，也會造 成再度加酸時的追逐作用（hunting)，導致酸劑及鹼劑 的浪費。一旦加酸系統因追逐作用或pH量測的時差 出問題時，將會使得碳酸成份與鈣離子在第一段逆滲 • 透處理器6中結合並快速形成結垢導致第一段逆滲透 • 處理器6的堵塞，進而造成整個逆滲透水處理系統的 崩潰。 另一方面，由於石夕是地球上含量第二高的元素， 1304356 ’ 待處理水中時常含有大量的二氧化矽（silica)，為了減 ' 輕二氧化矽對後段去離子裝置造成的負荷，不得不借 • 助於兩次的逆滲透處理。如前述不正確的加鹼發生， 會造成待處理水的pH值超過11，則此時二氧化矽會 變成溶於水的狀態，經逆滲透過濾濃縮後會造成其過 飽和而析出，進而造成管路的堵塞。二氧化矽造成的 0 堵塞對逆滲透水處理系統而言，並沒有適當的藥品可 用，只能用氫氟酸加以清洗，這對操作人員與環境造 成的傷害將無法以金額量化。 另外，習知二段式逆滲透水處理系統中，最後須 藉由使用真空脫氣裝置14去除水中的二氧化碳。然而 熟習技藝者均了解真空脫氣裝置的設置與此脫氣去除 水中二氧化碳的處理成本是相當昂貴，但若使用正壓 式脫氣塔，則易造成菌類與藻類增生的問題，且兩者 都須佔據很大的空間’致使得習知的二段式逆渗透水 ♦ 處理系統的體積無法縮小。另一方面，小型純水使用 ， 者因規模未大至可設置再生式去離子系統，因此必須 使用捨棄式去離子樹脂來處理水中碳酸成分。然而如 此一來卻會耗費驚人的成本且產生大量棄置樹脂，使 8 1304356 Λ 用上並不經濟，且會造成環保上的問題。 • 【發明内容】 為解決前述習知二段式逆滲透水處理系統中存在 的缺點，本發明之目的即在於提供一種二段式逆滲透 水處理系統，藉以解決習知二段式逆滲透水處理系統 Φ 中不易正確加鹼，以及需藉由真空脫氣裝置去除二氧 化碳的問題，藉以減少因過度加鹼對環境所造成的污 染，及提昇產水品質以減少進一步水淨化處理的廢水 排放量，藉以達到省水的目的。 根據本發明所指出之一種二段式逆滲透水處理系 統，包含： 一前處理器，用以對水進行初步過濾，以濾除該 水中雜質； 第一段逆滲透處理器； • 一陰離子交換器，其係用以去除該水中碳酸成 ， 分；以及 第二段逆滲透處理器； 其中，該前處理器、該第一段逆滲透處理器、該 9 1304356 陰離子交換器及該逆滲透處理器，係分別藉由一 管路依序串接。 本發明之另一目的係提供一種二段式逆滲透水處. 理方法，藉以有效降低習知二段式逆滲透水處理方法 中去除水中碳酸成份所需的成本。根據本發明所指出 之一種二段式逆滲透水處理方法，其步驟包含： (1) 自水源取得原水，並去除水中雜質； (2) 進行第一段逆滲透處理，以去除該原水中的鹼 土金屬離子； (3) 進行離子交換，以去除該原水中的碳酸成分； 以及 (4) 進行第二段逆滲透處理，以進一步去除該原水 中的碳酸成分。 來自水源的原水經以本發明二段式逆滲透水處理 系統與處理方法處理後，即可獲得具有良好水質的逆 滲透水。由於本發明中係使用陰離子交換器來去除水 中的碳酸成分（例如，碳酸根離子與重破酸根離子）， 因此無需使用設置成本和運轉成本都較高的真空脫氣 裝置。此外，由於陰離子交換樹脂可有效的去除前述 10 1304356 的碳酸成分，因此可改善因碳酸成分累積所造成之pH 調整困難的問題，藉此可有效避免因過度加鹼所造成 之經處理後的逆滲透水的水質劣化、後段處理負荷加 重，以及由追逐作用所造成之鹼劑與酸劑的浪費等問 題。 本發明將藉由參考下列的實施方式做進一步的說 明，這些實施方式並不限制本發明前面所揭示之内 容。熟習本發明之技藝者，可做些許之改良與修飾， 但仍不脫離本發明之範疇。 【實施方式】 參閱第二圖，係為本發明二段式逆滲透水處理系 統的示意圖。根據本發明所指出二段式逆滲透水處理 系統，包含一用以對水進行初步過濾，以濾除該水中 雜質的前處理器20、第一段逆滲透處理器24、一陰離 子交換器28與第二段逆滲透處理器30。其中，該前 處理器、該第一段逆滲透處理器、該陰離子交換器及 該逆滲透處理器，係分別藉由一管路依序串接。 於使用本發明二段式逆滲透水處理系統進行水處 1304356 理時，首先係將來自水源18的原水通過一前處理裝置 20，藉以去除原水中的雜質，包含砂粒、有色物質與 氣味物質，但並不僅限於此。可應用本發明中之前處. 理裝置，只要是任何習知可被應用於去除水中雜質的 處理裝置皆可被應用於本發明中，在此可舉出的例子 包含砂濾過濾器與活性碳處理器，但並不僅限於此。 由於習知當水的pH值降至4.3以下時，水中的碳 酸成分會完全轉變成為二氧化碳，因此在此將經前處 理裝置20處理後的原水加入酸劑，調整其pH值使其 不超過4.3，藉以使水中的碳酸成分轉變成為二氧化 碳。前述之碳酸成分包括碳酸根離子與重碳酸根離 子，但並不僅限於此。接著，將調整過pH值的水通 入第一段逆滲透處理器24中進行處理。為確保前述加 入的酸劑可均勻的混入水中，且可便於水中pH值的 監測，較佳為水經前處理裝置20處理後，先進入一第 一進水緩衝槽22中，使酸劑可均勻混入水中，便於調 整其pH值，之後再將水引入第一段逆滲透處理器24 中。前述之酸劑只要是習知可用於調整pH值者，皆 可被應用於本發明中，可舉出的例子包含鹽酸(HC1)， 1304356 • 但並不僅限於此。 • 水經第一段逆滲透處理器24處理過後，可將水中 • 所含有之驗土金屬離子濾、除，因此所排出的廢水中將 會具有高濃度的鹼土金屬離子，而通過第一段逆滲透 處理器24後的水中僅含有低濃度的鹼土金屬離子，其 可去除水中95%以上的驗土金屬離子。前述之驗土金 屬離子包含4弓離子，但並不僅限於此。由於水中的碳 酸成分已轉換為二氧化碳，因此不會與水中的鈣離子 結合形成碳酸鈣沉澱，而阻塞第一段逆滲透處理器 24。水中的二氡化碳會通過第一段逆滲透處理器24 而存留於經處理過的水中。 之後，對通過第一段逆滲透處理器24後的水中加 入驗劑，使水的pH上升，使經前述處理的水中之二 氧化碳再轉換為碳酸成分。接著，將調整過pH值的 水通入陰離子交換器28中進行處理。在此時加入的驗 • 劑量，無需達到使水中之二氧化碳全數溶於水中轉換 • 為碳酸成分的程度，僅需要有一部分轉換成碳酸成分 即可。當水中碳酸成分為陰離子交換器28所吸收時， 水中二氧化碳與碳酸成分間的平衡即會受到破壞，藉 13 1304356 • 此水中的二氧化碳即會溶解再轉換為碳酸成分以使其 ' 平衡得以維持。因此，藉此即可減少使水中二氧化碳 β 全數溶於水中轉換為碳酸成分所需的鹼劑用量。另. 外，為確保前述加入的鹼劑可均勻的混入水中，較佳 為水經加入驗劑後，先經過一混合器26中，使驗劑可 均勻地混入水中，便於可迅速地調整水的pH值。前 φ 述之鹼劑只要是習知可用於調整pH值者，皆可被應 用於本發明中，可舉出的例子包含氫氧化鈉(NaOH)， 但並不僅限於此。前述，混合器只要是習知可用於使 液體均勻混合者，皆可被應用於本發明中。熟習技藝 者藉由閱讀本說明書可輕易地了解到，前述之混合器 亦可以一緩衝水槽或其他可達成相同功能之裝置來替 代。當帶有碳酸成分的水通過陰離子樹脂交換器28 參 時，水中的碳酸成分即可為陰離子樹脂交換器28所吸 收而自水中去除。 • 最後，水再以第二段逆滲透處理器30進行處理， ’ 以進一步移除水中殘留的碳酸成分，藉此即可獲致具 有良好水質的水，此經處理過的水可先儲存於過濾水 儲存槽32中。為避免空氣中的二氧化碳再度溶入水 14 1304356 中，較佳為過濾、水儲存槽32預先充填氮氣。另外一方 面，經由第二段逆滲透處理器30處理後所排出的廢 水，由於僅含有少量的碳酸成分，故可回收再送至第 一進水緩衝槽22中與經前處理裝置20處理後的原水 混合，藉此可減少原水的需求量。 為即時監控水處理系統中碳酸成分不會累積超過 水處理系統的負荷，較佳係於第二段逆滲透處理器30 的產水口（亦即經處理過後之水的排水口）處設置一水 阻表（water resistance tester)，藉由檢測水中電阻率來 即時監測水中碳酸成分的累積狀況。當陰離子交換樹 脂28接近飽和時，水中的碳酸成分即會增加，此時水 阻表會因水阻下降而發出警報，藉此即可得知此時需 進行陰離子交換樹脂28的再生，以確保本發明水處理 系統的正常運作。為進一步確保本發明水處理系統未 及時停機時，也能維持水處理系統中的碳酸成分不會 突然的大幅增加，較佳係於第二段逆滲透處理器30 與第一進水緩衝槽22間設置一小型陰離子交換樹脂 34,藉以進一步確保碳酸成分不會在系統中造成累積。 由於本發明水處理方法中使用了陰離子交換樹 1304356 • 脂，因此可解決二氧化碳去除比例的變數，使得水處 " 理系統狀況的控制變得較為單純，且一旦達到穩定的 ‘ 調整結果，水處理系統的狀況就將只受原水水質變動 的影響。這方面就自來水而言，通常是指水溫的變化； 對地下水而言，則會受豐水期與枯水期的水質變動影 響。這些因素的改變都是漸進的，只要有pH表的讀 φ 數做參考都足以應變。 另一方面，於前述離子交換器因吸收水中碳酸成 分而達到飽和時，此時即需要使離子交換器進行再 生，藉以將所吸收之碳酸成分釋放出，因此離子交換 器的再生排水中將含有高濃度的碳酸成分。為解決此 一廢水排放問題，於本發明中可進一步包含一步驟， 即將此含有高濃度碳酸成分的再生排水與前述由第一 段逆滲透器所排出之含有高濃度鹼土金屬離子的廢水 混合，以使此混合液中的碳酸成分與鹼土金屬離子結 • 合而形成沉澱析出（例如，形成碳酸鈣沉澱），藉此即 • 可使此廢水混合液軟化，並使其可回收再利用。最後， 再將以此方式軟化後之廢水與來自水源的原水混合 後，即可減少原水的需求量以及廢水的排放量。 16 1304356 【圖式簡單說明】 第一圖係為習知二段式逆滲透水處理系統的示意 圖；以及 第二圖係為本發明二段式逆滲透水處理系統的示意 圖。 【主要元件符號說明】 2 前處理器 4 第一進水緩衝槽 6 第一段逆滲透處理器 8 第二進水緩衝槽 10第二段逆滲透處理器 12過濾水儲存槽 14真空脫氣裝置 18水源 20前處理裝置 22第一進水緩衝槽 24第一段逆滲透處理器 17 13043561304356 IX. Description of the invention: [Technical field to which the invention pertains] % The present invention relates to a two-stage reverse osmosis water treatment system, and more particularly to a two-stage reverse osmosis water treatment system capable of effectively removing carbonic acid components in water. [Prior Art] In the process of pure water, due to the application of the reverse osmosis water treatment system in the process of removing water ions and filtering impurities, there is an economic and functional advantage that is difficult to replace, so reverse osmosis water treatment The system has become a necessary equipment for high-purity pure water users such as the semiconductor industry and the pharmaceutical industry. One of the features of the reverse osmosis water treatment system is to use a part of the discharge water to discharge the impurities in the filtered and concentrated water, so that the reverse osmosis water treatment system can be prevented from being blocked by the accumulation of impurities. Keep operating steadily under conditions. However, in the process of industrial concentration and growth, regional water shortages have gradually emerged. In order to improve the efficiency of water use in water treatment systems and reduce the amount of wastewater discharged during treatment, it has become one of the necessary conditions for the continued growth of the 1304356 industry. In order to overcome the problem of excessive wastewater discharge from the conventional reverse osmosis water treatment system and reduce the discharge of necessary wastewater, a two-stage reverse osmosis water treatment system has been proposed to reduce the water quality of the reverse osmosis water to reduce the purification. Waste water discharge. Referring to the first figure, it is a schematic diagram of a conventional two-stage reverse osmosis water treatment system. The conventional two-stage reverse osmosis water treatment system includes a front processor 2, a first water inlet buffer tank 4, a first stage reverse osmosis processor 6, a second water inlet buffer tank 8, and a second stage reverse osmosis treatment. The device 10, a filtered water storage tank 12 and a vacuum degasser 14. In the water treatment, first, the acid is added before the water to be treated enters the first stage reverse osmosis processor 6, and the pH of the water to be treated is lowered to 4.3 or less, thereby causing the carbonic acid component in the water (for example, carbonate ions or The salt is completely converted into carbon dioxide to prevent the carbonic acid component in the water from being combined with ions of an alkaline earth metal such as calcium into a scale such as calcium carbonate during the reverse osmosis treatment, causing clogging of the reverse osmosis processor. When the water to be treated is filtered by the first-stage reverse osmosis processor 6 to remove calcium ions, the pH of the alkali-adjusted water is added to 8.3 or more, thereby converting the carbon dioxide in the water into carbonic acid components such as bicarbonate ions or carbonate ions. . Thereafter, the carbonic acid component is removed by the second stage reverse osmosis processor 10. At this time, the water discharged from the 1304356' second stage reverse osmosis processor ίο will have a higher concentration of carbonic acid. The water from the second stage reverse osmosis processor 10 is further acidified to convert the carbonic acid component into carbon dioxide, and finally the carbon dioxide in the water is removed by the air venting device 14 or the degassing tower. The water after the carbon dioxide treatment is removed can be further introduced into the first influent buffer tank 4 and mixed with the water to be treated from the water source, and then recycled, and φ is used to achieve the purpose of reducing waste water discharge. However, there are still some problems in the conventional two-stage reverse osmosis water treatment system. For example, since the acid-cracking component is a buffer for acid-balance analysis, it is difficult to add the correct amount of alkali in the above method. When too much alkali is added, in addition to the deterioration of the water quality of the water after the second-stage reverse osmosis treatment, and in addition to the load of the post-treatment treatment, the hunting effect when the acid is re-added may occur, resulting in an acid agent. And the waste of alkaline agents. Once the acid addition system has a problem due to chasing or pH measurement, it will cause the carbonic acid component to combine with the calcium ion in the first stage of the reverse osmosis processor 6 and rapidly form scale to cause the first reverse osmosis. The blockage of the processor 6 causes a collapse of the entire reverse osmosis water treatment system. On the other hand, because Shi Xi is the second highest content element on the earth, 1304356 'the water to be treated often contains a large amount of silica, in order to reduce the load caused by the light bismuth dioxide on the deionization device in the latter stage. Do not borrow • Help with two reverse osmosis treatments. If the above-mentioned incorrect addition of alkali occurs, the pH of the water to be treated will exceed 11, and then the cerium oxide will become dissolved in water, and after being concentrated by reverse osmosis filtration, it will be supersaturated and precipitated, thereby causing the tube. The road is blocked. The clogging caused by ruthenium dioxide is not available for reverse osmosis water treatment systems. It can only be cleaned with hydrofluoric acid. This damage to the operator and the environment cannot be quantified by the amount. In addition, in the conventional two-stage reverse osmosis water treatment system, carbon dioxide in the water must be removed by using the vacuum degassing device 14. However, those skilled in the art understand that the setting of the vacuum degassing device and the treatment cost of degassing and removing carbon dioxide in the water are quite expensive, but if a positive pressure degassing tower is used, it is easy to cause problems of fungi and algae proliferation, and both It has to occupy a lot of space', so that the volume of the conventional two-stage reverse osmosis water treatment system cannot be reduced. On the other hand, the use of small pure water is not large enough to provide a regenerative deionization system, so it is necessary to use a deionized deionized resin to treat carbonic acid in water. However, at this time, it is costly and generates a large amount of discarded resin, making 8 1304356 并不 uneconomical and causing environmental problems. SUMMARY OF THE INVENTION In order to solve the above-mentioned shortcomings of the conventional two-stage reverse osmosis water treatment system, the object of the present invention is to provide a two-stage reverse osmosis water treatment system, thereby solving the conventional two-stage reverse osmosis water. It is difficult to properly add alkali in the treatment system Φ, and the problem of removing carbon dioxide by vacuum degassing device, so as to reduce the pollution caused by excessive alkali addition, and improve the quality of water production to reduce the discharge of wastewater from further water purification treatment. In order to achieve the purpose of water saving. A two-stage reverse osmosis water treatment system according to the present invention comprises: a pre-processor for preliminary filtering of water to filter out impurities in the water; a first stage reverse osmosis processor; And a second stage reverse osmosis processor; wherein the pre-processor, the first stage reverse osmosis processor, the 9 1304356 anion exchanger, and the reverse osmosis treatment The devices are connected in series by a pipeline. Another object of the present invention is to provide a two-stage reverse osmosis water treatment method for effectively reducing the cost of removing carbonic acid components from water in a conventional two-stage reverse osmosis water treatment process. According to the invention, a two-stage reverse osmosis water treatment method comprises the steps of: (1) obtaining raw water from a water source and removing impurities in the water; (2) performing a first stage reverse osmosis treatment to remove the raw water. An alkaline earth metal ion; (3) performing ion exchange to remove carbonic acid components in the raw water; and (4) performing a second reverse osmosis treatment to further remove carbonic acid components in the raw water. The raw water from the water source can be treated with the two-stage reverse osmosis water treatment system and the treatment method of the present invention to obtain reverse osmosis water having good water quality. Since the anion exchanger is used in the present invention to remove carbonic acid components (e.g., carbonate ions and heavy acid-breaking ions) in water, it is not necessary to use a vacuum deaerator having a high installation cost and a high running cost. In addition, since the anion exchange resin can effectively remove the carbonic acid component of the above 10 1304356, the problem of pH adjustment caused by the accumulation of carbonic acid components can be improved, thereby effectively preventing the treated inverse caused by excessive alkali addition. The water quality of the permeated water is deteriorated, the post-treatment load is aggravated, and the alkali agent and the acid agent are wasted by the chasing action. The invention will be further illustrated by reference to the following embodiments which are not intended to limit the invention. A person skilled in the art can make some modifications and modifications without departing from the scope of the invention. [Embodiment] Referring to the second figure, it is a schematic diagram of a two-stage reverse osmosis water treatment system of the present invention. The two-stage reverse osmosis water treatment system according to the present invention comprises a pre-processor 20 for preliminary filtering of water to filter out impurities in the water, a first stage reverse osmosis processor 24, and an anion exchanger 28. And the second stage reverse osmosis processor 30. The pre-processor, the first-stage reverse osmosis processor, the anion exchanger, and the reverse osmosis processor are sequentially connected in series by a pipeline. When using the two-stage reverse osmosis water treatment system of the present invention for water treatment 1304, the raw water from the water source 18 is first passed through a pretreatment device 20 to remove impurities in the raw water, including sand particles, colored materials and odor substances. But it is not limited to this. The prior art processing apparatus of the present invention can be applied to any of the conventional treatment apparatuses which can be applied to remove impurities in water, and examples thereof include sand filter and activated carbon treatment. But not limited to this. Since it is known that when the pH of the water falls below 4.3, the carbonic acid component in the water is completely converted into carbon dioxide. Therefore, the raw water treated by the pretreatment apparatus 20 is added to the acid agent, and the pH is adjusted so as not to exceed 4.3. In order to convert the carbonic acid component of the water into carbon dioxide. The aforementioned carbonic acid component includes, but is not limited to, carbonate ions and bicarbonate ions. Next, the pH adjusted water is passed to the first stage reverse osmosis processor 24 for processing. In order to ensure that the acid agent added can be uniformly mixed into the water, and the pH value of the water can be monitored, it is preferred that the water is treated by the pretreatment device 20 to enter a first water buffer tank 22 to make the acid agent It is evenly mixed into the water to facilitate adjustment of its pH, and then water is introduced into the first stage reverse osmosis processor 24. The above acid agent can be used in the present invention as long as it is conventionally used for pH adjustment, and examples thereof include hydrochloric acid (HC1), 1304356. However, it is not limited thereto. • After the water is treated by the first reverse osmosis processor 24, the soil metal ions contained in the water can be filtered and removed, so that the discharged wastewater will have a high concentration of alkaline earth metal ions, and the first stage The water after the reverse osmosis processor 24 contains only a low concentration of alkaline earth metal ions, which removes more than 95% of the soil metal ions in the water. The aforementioned soil metal ions contain 4 bow ions, but are not limited thereto. Since the carbonic acid component of the water has been converted to carbon dioxide, it does not combine with calcium ions in the water to form a calcium carbonate precipitate, but blocks the first stage reverse osmosis processor 24. The carbon dioxide in the water is retained in the treated water by the first stage reverse osmosis processor 24. Thereafter, the test solution is added to the water passing through the first-stage reverse osmosis processor 24 to raise the pH of the water, and the carbon dioxide in the water treated as described above is again converted into a carbonic acid component. Next, the pH-adjusted water is passed to an anion exchanger 28 for treatment. The dose to be added at this time does not need to be such that the carbon dioxide in the water is completely dissolved in water. • To the extent of the carbonic acid component, only a part of the carbon dioxide component needs to be converted. When the carbonic acid component in the water is absorbed by the anion exchanger 28, the equilibrium between the carbon dioxide and the carbonic acid component in the water is destroyed. By 13 1304356, the carbon dioxide in the water is dissolved and converted to carbonic acid to maintain its balance. Therefore, it is possible to reduce the amount of the alkali agent required to convert the carbon dioxide β in water to the carbonic acid component. In addition, in order to ensure that the above-mentioned alkali agent can be uniformly mixed into the water, it is preferred that the water is passed through a mixer 26 after the test is added, so that the test agent can be uniformly mixed into the water, so that the water can be quickly adjusted. pH value. The base agent of the former φ can be used in the present invention as long as it is conventionally used for pH adjustment, and examples thereof include sodium hydroxide (NaOH), but are not limited thereto. As described above, the mixer can be used in the present invention as long as it is conventionally used for uniformly mixing a liquid. As will be readily appreciated by those skilled in the art from reading this description, the aforementioned mixers may be replaced by a buffer tank or other means for achieving the same function. When water having a carbonic acid component is passed through the anion resin exchanger 28, the carbonic acid component in the water is absorbed by the anion resin exchanger 28 and removed from the water. • Finally, the water is treated with a second stage reverse osmosis processor 30, to further remove residual carbonic acid from the water, thereby obtaining water with good water quality. The treated water can be first stored in the filter. In the water storage tank 32. In order to prevent the carbon dioxide in the air from being dissolved again into the water 14 1304356, it is preferred to filter and the water storage tank 32 is prefilled with nitrogen. On the other hand, the waste water discharged after being treated by the second stage reverse osmosis processor 30 can be recovered and sent to the first water inlet buffer tank 22 and treated by the pretreatment device 20 since it contains only a small amount of carbonic acid components. The raw water is mixed, thereby reducing the amount of raw water required. In order to monitor immediately that the carbonation component of the water treatment system does not accumulate more than the load of the water treatment system, it is preferred to provide a water at the water outlet of the second stage reverse osmosis processor 30 (i.e., the drain of the treated water). The water resistance tester monitors the accumulation of carbonic acid in water by detecting the resistivity in water. When the anion exchange resin 28 approaches saturation, the carbonic acid component in the water increases, and the water resistance meter will give an alarm due to a decrease in water resistance, thereby knowing that regeneration of the anion exchange resin 28 is required at this time to ensure The normal operation of the water treatment system of the present invention. In order to further ensure that the water treatment system of the present invention is not shut down in time, the carbonation component in the water treatment system can be maintained without a sudden and substantial increase, preferably in the second stage reverse osmosis processor 30 and the first water inlet buffer tank 22 A small anion exchange resin 34 is interposed to further ensure that the carbonic acid component does not accumulate in the system. Since the anion exchange tree 1304356 • grease is used in the water treatment method of the present invention, the variable of the carbon dioxide removal ratio can be solved, so that the control of the water system is relatively simple, and once the stable 'adjustment result is reached, the water The condition of the treatment system will only be affected by changes in the quality of the raw water. In this respect, in the case of tap water, it usually refers to changes in water temperature; for groundwater, it is affected by changes in water quality during the wet and dry periods. The changes in these factors are gradual, as long as there is a reading of the φ of the pH meter as a reference is sufficient. On the other hand, when the ion exchanger is saturated by absorbing the carbonic acid component in the water, the ion exchanger needs to be regenerated at this time, so that the absorbed carbonic acid component is released, so that the regenerative drainage of the ion exchanger will be contained. High concentration of carbonic acid. In order to solve the problem of wastewater discharge, the present invention may further comprise a step of mixing the regenerated wastewater containing the high-concentration carbonic acid component with the wastewater containing the high-concentration alkaline earth metal ions discharged from the first-stage reverse osmosis apparatus. The carbonic acid component in the mixture is combined with an alkaline earth metal ion to form a precipitate (for example, a calcium carbonate precipitate), whereby the wastewater mixture can be softened and recycled. Finally, by mixing the wastewater softened in this way with the raw water from the water source, the amount of raw water and the amount of wastewater discharged can be reduced. 16 1304356 [Simple description of the drawings] The first figure is a schematic diagram of a conventional two-stage reverse osmosis water treatment system; and the second figure is a schematic view of the two-stage reverse osmosis water treatment system of the present invention. [Main component symbol description] 2 Front processor 4 First water inlet buffer tank 6 First stage reverse osmosis processor 8 Second water inlet buffer tank 10 Second stage reverse osmosis processor 12 Filter water storage tank 14 Vacuum degasser 18 water source 20 pretreatment device 22 first water inlet buffer tank 24 first stage reverse osmosis processor 17 1304356
26混合器 28陰離子交換器 30第二段逆滲透處理器 32過濾水儲存槽 34小型陰離子交換樹脂 1826 mixer 28 anion exchanger 30 second stage reverse osmosis processor 32 filtered water storage tank 34 small anion exchange resin 18